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<?php interface B {} class A implements B {} class C extends A {} $a = new A; $c = new C; var_dump($c instanceof $a); var_dump($a instanceof $b); echo "C:\n"; var_dump($c instanceof C); var_dump($c instanceof A); var_dump($c instanceof B); echo "A:\n"; var_dump($a instanceof C); var_dump($a instanceof A); var_dump($a instanceof B);
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) Warning: Undefined variable $b in /in/agKSC on line 11 Fatal error: Uncaught Error: Class name must be a valid object or a string in /in/agKSC:11 Stack trace: #0 {main} thrown in /in/agKSC on line 11
Process exited with code 255.

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